Clock controlled by reversals of electric current.



PATENTED FEB. 12, 1907.

M. FISCHER. CLOCK CONTROLLBD BY REVERSALS 0F ELECTRIC CURRENT.

APPLICATION FILED SEPT. 1. 1904.

Imfen 2M@ iwf/M www am i l f] M m M. .mf w

UNITED sTATIgsA PATENT cierren.

MARTIN FISCHER, or ZURICH, sWITznRLAND 5;'

CLOCK CONTROLLED BY REVERSALS OF ELECTRIC CURRENT.

Specification of Letters Patent.

Patented Feb. 12, 1907.

, Application' filed September l, 1904. Serial No. 223.047.

together, and they are therefore compelled to move together by the action of the current.

N ow in a secondary clock of this type constructed in accordance with this invention two separate ratchet-levers are employed, which are causedby spring-pressure to engage with the teeth of a ratchet-wheel. Each of these ratchet-levers is caused, by means of a polarized armature, to move alternatel out of engagement with the teeth of the"l ratchet-whee in opposition to its spring,

vwhile at the same time the other ratchetlever is caused by its spring to engage with the teeth of the ratchet-wheel: 'and thus to rotate the latter. 4

In the accompanying drawings, which illustrate, by way of example, two constructions of apparatus according to this invention, Fi ratchetevers and the ratchet-wheel of one construction of a secondary clock controlled by reversals of eletcric current with the armature and electromagnet. Fig. 2 shows dia'rammatically the other construction A without the armature and electromagnet.

Referring first to Fig. l, the two ratchetlevers 3 and 4 are pivoted, respectively, on axles' 5 and 6 and are connected at their shorter upper arms to two tension-springs 1 and 2, respectively, which have a constant tendency to move the ratchet-pins 9 and 10, arranged on the lever-arms of the respective levers into engagement with the teeth of the ratchet-wheel 12,which is fixed on an axle 13.

A polarized armature 11, upon which an electromagnet 14 is adapted to act, is pivoted on an axle 15, so that the armature by striking in turn against each of the pins 7 and 8, provided on the ratchet-levers 3 and 4, is able to rotate the ratchet-levers on their pivots 5 and 6 in opposition to the respective springs 1 and 2. The manner of operation of this apparatus is as follows: By the action re 1 shows diagrammatically two of the current in the coils of the electr'omag` net 14 the armature 11 is moved alternately to the right and to the left on its axis 15, whereby 1t moves the ratchet-pins 9 and 10 alternately out of engagement with the teeth ofthe wheel 12-that is to say, while one ratchet-lever is moved out of the teeth the other ratchet-lever is simultaneously caused by its spring to act upon a tooth of the ratchet-wheel, and thus rotate the ratchetwheel. In the construction of apparatus shown in Fig. 2 the ratchet-levers 3 and 4, which are mounted on .the axes 5 and 6, are caused by means of the pawls 16 and 17 to engage with the ratchet-Wheel 12.'

` In the construction shown in Fig. 2 I provide a pin or other abutment for each of the pawls 16 and 17 to limit their upward swing,

as shown at 16 17 respectively. The manner of operation of this construction is the same as that shown in Fig. 1. The rocking movement of the polarized armature 11 on its axle alternately to the right and to the left rotates the ratchet-wheel 12, because when the armature 11 by striking against the pin 8 of the ratchet-lever 4 moves the ratchetpawl 17 out of one tooth-space in opposition to the spring 2 simultaneously the pawl 16 is caused, by the rotation of the ratchet-lever 3 on its axle 5, due to the action of the spring 1, to actzupela tooth of the ratchet-wheel 12. In; this 'manner rotation of the ratchet-wheel is produced, 'i

A singletensionspring fixed between the two long arms of the ratchet-levers 3 and 4 may be employed instead of the two springs 1 and 2.

Having now particularly described and ascertained the nature of the said invention and in what mannerthe same is to be performed, I declare that what I claim is- 1. In a secondary clock, a time mechanism having a ratchet-wheel, a pair of independently-mounted ratchet-levers, a spring for each lever to urge it against the wheel and means operated by electric-current impulses to alternately move one lever out of contact with the -wheel against its s ring action and simultaneously release t e other lever to permit its spring to urge said other IIO to limit the movement of the independent levers from the wheel and mechanism actuated at time/intervals by electric impulses to alternately move one lever from the wheel and ,simultaneously release the other lever t0 allow its spring to urge said other lever against the wheel to drive it.

3. In a secondary clock, a time mechanism controlled and .operated by electric impulses having a time-wheel, two independently pivoted ratchet-levers of different lengths7 springs to urge the levers a ainst the wheel, means to engave one of t e levers above and the other beIow its pivot-point to give said levers their idle movement, said means actuated at time intervals by electriccurrent impulses7 substantiallyT as described.

4; In a secondary clock, a time-wheel havname to this specification in the presence of 3o two subscribing witnesses.

MARTIN FISCHER.

lVitnesses:

PAUL RUEF, WILLIAM STEHLER. 

